Question
Carl has some black and blue balls. The total mass of all his balls is 192 g. He has 3 less black balls than blue balls. The average mass of the black balls is 8 g. The average mass of the blue balls is 10 g. How many balls does Carl have altogether?
3 m

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Carl has some black and blue balls. The total mass of all his balls is 192 g. He has 3 less black balls than blue balls. The average mass of the black balls is 8 g. The average mass of the blue balls is 10 g. How many balls does Carl have altogether?